Double furnace



(Nb Model.)

G. RHODEN.

DOUBLE FURNACE. I Patented Oct. 8, 1884.

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GEORGE RHODEN, OF CLEVELAND, OHIO.

DOUBLE FURNACE.

sPEorFroA'rIonT forming part of Letters Patent No. 307,143, datedOctober 28, 1884.

Application filed January 22, 1884. (No model.)

T0 at whom it may concern.-

, Be it known that I, GEORGE RHODEN, of Cleveland, in the county ofvGuayhoga and State of Ohio, have invented a certain new and ImprovedDouble Furnace; and I do hereby declare that the following is a full andcomplete description thereof.

The nature of this invention relates to that class of furnacesconstructed for reheating ingots and other bodies of metal, and also forannealing purposes; and the object of the invention is to more fullyutilize the fuel by consuming the gases eliminated by the ignited fuel,which, in ordinary furnaces for the above specified purpose, pass offunconsumed and consequently lost. A more full description of theaforesaid invention, and of the practical operation of the same, will befound in the following specification, and illustrated in the annexeddrawings, making'a part of the same, in which- Figure 1 represents ahorizontal section of the furnace, showing a plan view of the interiorthereof. Fig. 2 is a longitudinal vertical section taken through theline 4 4. Fig. 3 is an end elevation of the furnace.

Like letters of reference denote like parts in the drawings. k

The invention above alluded to consists of two furnaces, A and B, soconstructed and arranged in relation to each other that they have anopen communication one with the other, and conjointly operative forheating purposes; or each one may be used separately, if so desired. Thefurnaces are duplicates; hence a description of one of them will servefor the other. Said furnaces, like those in ordinary use, areconstructed of brick, having their exterior sides plated with sheetmetal secured with stay-rods in the usual way.

0, Figs. 1 and 2, is the fire-place of the furnace A, and D the ash-pit.E is the door of the fire-place; F, the grate-bars, and G thebridge-wall, behind which is the receivingchamber H, wherein the ingotsor other materials are placed for being reheated. I I are the doors ofthe chamber, and J the throat of the chamber, opening into thetransverse'flue K. Said flue communicates with the smokestack L throughthe passage M, provided with a damper, N, for closing the said passage.

. The furnace A above described is put in communication with the furnaceB by the transverse flue K, which, as will be seen in Fig. 1, extendsfrom the rear end of the furnace A to the front end of the furnace B.The two furnaces are arranged in respect to each other side by side, butreversely, as seen in the drawings. The two furnaces are divided fromeach other .by the partition 0, and have no communication one with theother excepting through the transverse flue K, above referred to, and acorresponding flue, P, at the opposite end of the plant, both of whichdues are provided with dampers, respectively, a and Z2, whereby the twofurnaces maybe shut off from each other or opened, as may be desired.Said dampers are operated by levers, one of which is shown at b in Fig.3. The other is substantially like it.

The furnace B, as above said, is a duplicate ofthe furnace A, 'and ofwhich H is the receivingchamber; G, the bridgewall; O, the fire-place,and E the door thereof, and I the doors of the heating-chamber.

Practically the operationof the two furnaces is as follows: The flame,heat, and gases in the fire-place 0 pass therefrom over the bridgewallinto the chamber H, in which are placed the ingots or other materials tobe heated. The smoke and unconsumed gases that may be in thechamber,instead of being allowed to escape therefrom directly into thestack L, (as in the ordinary single furnace,) are shut off therefrom bythe damper N, and made to pass along the flue K to ,the fire-place 0,onto the incandescent coals therein, and by which the smoke orunconsumed gases from the fireplace (1 are burned, and which at the sametime increase the activity and heat of the fire therein, therebyproducing an increment of heat by the ignition and consumption of thegases from the fire-place O, which, as before said, are unconsumed andlost in the ordinary singlefurnace. That the smoke, &c., from thefurnace A may pass through the flue K to the furnace B, the damper a,operated by the lever 12, Fig. 3, is lifted, as shown in Fig. 2, for afree passage to the furnace B. The-heat,

smoke, and gasesfrom the fire-place 0 pass.

therefrom into the chamber H for heating the materials placed therein,which is more quickly done than in a single furnace, in virtue of theincrement of heat caused by the burning of the gases from the fire at O,The smoke, 800., are allowed to escape from the chamber or oven Hthrough the throat J, thence into the stack L, the damper 0 being openedfor that purpose, whereasthe damper i) in the flue P is closed toprevent the smoke from returning to the fire place 0. It will be'obviousfrom the corelation an joint operation of the two furnaces abovedescribed that there can be but little waste in the matter of fuel ascompared with that of a single furnace employed forheating purposes, andthe process of heating is effected in much less time in consequence ofthe increment of heat produced by the consumption of the smoke and gasesin the two furnaces adapted to earh other, as herein described.

' It will be proper to remark here that the arrows indicate the courseof the smoke, 850., starting from the fireplace G aroundto the fireplaceG. The current of smoke, &c.,however, may start from the fireplace O,and pass around to the fireplace O and chamber H, and

' escape therefrom through the stack L by sim- 1y closing the damper aand staclrdamper c, and opening the damper b and the stackdamper N,thereby causing the smoke, &c., to pass from the fire-place 0 around tothe fireplace 0, thence into the chamber H, from Which it will escapethrough the stack L, as aforesaid. It is desirable that this change inthe startingplace of the smoke, &c., be made each time that the fire issupplied with fresh fuel or coalthat is to say, when fresh fuel is fed{to the fire at 0, none is supplied at the same time to the fire at C,it being allowed to continue in a clear burning condition, so that thegases and smoke caused by the fresh coals on the fire at 0 will beimmediately burned by the live bed of coals of the fire at O,

l l l and so when fresh fuel is supplied to the fire at 0 none issupplied at the same time to the fire at O. The smoke, gases, &c.,caused by the fresh fuel on the fire at C will pass over to the clearburning coals at Oby closing the dampers a c and opening the dampers band N, and so on. Each time that one of the fires is supplied with coala change is made in the course ofthe smoke, &c., from one fire-place tothe other by shutting and opening the dampers, as described. The dampersN and c are operated by levers or handles, respectively, in connectiontherewith, as are the levers for operating the dampers a and I). Saiddampers may be placed on the top of the stack instead of near the base,as seen in the drawings.

Although the furnaces are especially intended for reheating purposes,they are equally well adapted for heating steam-boilers. or forpuddling-furnaces, and other similar heating purposes, requirin for thatpurpose only such modification as to properly adapt them to the purposesabove mentioned. l

I do not confine myself to the exact con- .struction of the details ofthe two furnaces as herein shown and described, as the same may bemodified in some particulars without changing the essential nature ofthe invention.

WVhat I claim as my invention, anddesireto secure by Letters Patent, is

In furnaces for heating ingots and other articles, the combination andreverse arrangement of the furnaces A and B in corelation for operatingconjointly by means of transverse fiues K and 1?, provided with dampers,respectively, a and b, and stack-dampers, substantially as described,and for the purposes specified.

In testimony whcreofI affiX my signature in presence of two witnesses.

GEORGE RHODEN.

Witnesses:

J. H. BURRIDGE,

O. H. TURNEY.

